Unit_4_Object Oriented Programming with Java

Which of these operators is used to allocate memory to array variable in Java?

• malloc

• alloc

• new

• new malloc

Which of these is an incorrect array declaration?

• int arr[] = new int[5];

• int arr[5] = new int [];

• int arr[];

  arr = new int[5];

• int [] arr = new int[5];

Which of these is an incorrect Statement?

• It is always necessary to use new operator to initialize an array.

• Array can be initialized using comma separated expressions surrounded by curly braces.

• Array can be initialized when they are declared.

• None of the mentioned

Which of these is necessary to specify at time of array initialization?

• Row

• Column

• Both Row and Column

• None of the mentioned

Which of these best describes an array?

• A data structure that shows a hierarchical behavior

• Container of objects of similar types

• Arrays are immutable once initialized

• Array is not a data structure

How do you instantiate an array in Java?

• int arr[] = new int(3);

• int arr[];

• int arr[] = new int[3];

• int arr() = new int(3);

What is the output of the given piece of code?

• 4

• 5

• ArrayIndexOutOfBoundsException

• InavlidInputException

When does the ArrayIndexOutOfBoundsException occur?

• Compile-time

• Run-time

• Not an error

• Not an exception at all

What are the advantages of arrays?

• Objects of mixed data types can be stored

• Elements in an array cannot be sorted

• Index of first element of an array is 1

• Easier to store elements of same data type

Assuming int is of 4 bytes, what is the size of int arr[15];?

• 15

• 19

• 11

• 60